Macbook Silver display to vga doubler

I have a Macbook silver and I bought a SIIG VGA 2 port video splitter and I cannot get the signal to carry through. I have an old macbook the white one and that works fine. I want to use the new macbook with a QIT 300 tablet and a projector at the same time separately the macbook sends the signal to each one fine, but I can't seem to use it with this VGA 2 splitter. I have had no luck and Apple support has had no answers so far. Anybody come across this issue yet, or know of an answer? I would much appreciate it.
Thanks.

Sorry, I'm still confused. You said, +"I have an old macbook the white one and that works fine."+
By this do you mean that you can simultaneously run the projector and the tablet with your white MB but with the silver MB it doesn't work?

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